Steam-boiler attachment



(No Model.) sheets-Sheet 1. J. OBRIEN & G'. K. PIGKLES.

STEAM BOI'LBR ATTAGHME NT.

No. 477,145. Patented June 14, 1892.

J. OBRIBN an o. K. PICKLBS.v

No. 477,145. Patented June 14, 1892.

(No Model.)

J. OBRIBN 8v C. K. PICKLE 5 Sheets-Sheet 3. S.

STEAM BOILBR ATTACHMENT.

Patented June 14,1892.

; .semmil ...Timun 1N() Model.) 5 Sheets-Sheet 4.

J. OBRIEN 8v G. K. PICKLES. STEAM BUILER ATTAGHMENT.

No. 477,145. Patented June 14,1892.

s". l w 'x I 1 l l'" "l" i 'M1111 i IIL.. lirlllllnlulmllmllumlun|1111 -1 Il *i 111111121111 (No Model.) Sheet.-Sheet 5.

J. 0BR1EN& o. K. PIGKLES. STEAM BOILBR ATTACHMENT.

No. 477,145. Patented June 14, 1892.

UNITED STATES PATENT OFFICE.

JOHN OBRIEN AND CHARLES K. PICKLES, OF ST. LOUIS, MISSOURI.

STEAM-BOILER ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 477,145, dated June 14, 1892.

i Application filed March 31, 1892. Serial No. 427,241. (No model.)

T0 @ZZ whom t may concern:

Be it known that we, JOHN OBRIEN and CHARLES K. PIcKLEs, both of the city of St. Louis, in the State of Missouri, have invented a certain new and useful Improvement in Steam-Boiler Attachments, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

Our invention relates to certain improvements in that class of steam-boiler attachments in which hollow grate-bars are employed, the bars communicating With front' and rear manifolds, through which the water circulates to the boiler.

Our invention consistsin features of novelty hereinafter fully described, and pointed out in the claims.

Figure I is a side viewof ourimproved boiler, showing a furnace in section. Fig. II isavertical section taken on line II II, Fig. I. Fig. III is a detail top view. Fig. IV is part an end View and part in vertical section. Fig. V is a View illustrating the manner of securing the hollow grate-bars to the manifold. Fig. VI is afront end View, part in section, illustrating a modification. Fig. VII is a detail top view of the form shown in Fig. VI. Figs. VIII and IX'are detail views showing the construction of the ash-receiving pit.

Referring to the drawings, l represents the boiler, placed in the usual setting 2.

3 is the main fire-box, 4 a subtile-box, and 5 the ash-pit.

(i represents the grate of the re-boX, and 7 the grate of the sub-iire-boX. The grate (5 is composed of a number of tubes joined at their outer ends to a manifold 8 and at their inner ends to a manifold 9, as clearly shown in Fig. I. As a manner of connecting the tubes to the manifolds We have shown in Fig. V a construction in which the tubes are screwed into one of the manifolds and have upon their other ends externally-threaded sleeves IO, which screw into the other manifold, and these ends of the tubes are flared so that a tight joint will be formed between the collars and the tubes. j

Il represents a settling or collecting tank located above the grate of the furnace, so as t0 be subjected to the heat of the furnace, and which communicates with the boiler and with the hollow grate through one or both of the manifolds. We have shown two of these tanks, 011e located on each side of the boiler. In the forni 'shown in Figs. I to IV, inclusive, the outer end of each tank is connected to the manifold 8 by means of a pipe I2, which preferably extends a short distance n p into the tank, as shown by dotted linesiu Fig. I, and the inner end of each tank is connected to the manifold 9 by the pipe 13, which preferably extends a considerable distance up into the tank, as shown by dotted lilies in Fig. I. The inner end of each tank is connected to the boiler by a pipe I4, and the other end of each tank is connected to the boiler by a pipe I5. In this form of our invention the water circulates from the boiler through the pipes 15 into the tanks 1I, thence through the pipes I2 into the manifold S, thence through the hollow grate-bars G into the manifold 9, thence through the pipes I3 back into the tanks II, and thence through the pipes I-t into the boiler. The tanks Il being subjected to the heat of the iire-box, it will be seen that the water after entering them through the pipes I3 will reach its highest point of temperature, the result being,r that the sediment and linie in the water will be precipitated and will settle iu the tanks Il, from which it can be blown out or removed, and thus does not enter the boiler.

In the form shown in Figs-VI and VII the tanks II are shown suspended from theboiler by means of straps 1G, and in this forni ofthe invention the water, instead of passing from the boiler to the tanks Il and thence to the manifold S, passes direct from the boiler to the manifold 8 through pipes I7, the remainder of the construction being the same as that shown in the other figures.

In Figs. VIII and IX we have shown a pit 20 for receiving the ashes from the ash-pit. This pit has doors 2l, which when open lean against the front plate of the furnace and when down close the pit, so as not to interfere with the firing of the furnace.

\Ve claim as our invention- 1. The combination, in a steam-boiler attachment of a downdraft-furnace, of hollow grate-bars, a boiler, a tank located above the grateebars and subjected to the heat of the fire-box, and pipes'forming a communication IOO between the boiler, hollow grate-bars, and tank, substantially as and for the purpose set forth.

2. In a boiler attachment of a downdraftfurnace, the combination of hollow grate-bars communicating with front and rear manifolds, a pipe forming a communication between the boiler and the front manifold, a settling-tank located above the grate-bars, a pipe forming a communication between the rear manifold and the tank7 and a pipe forming a communication between the tank and the boiler, substantially as and for the purl pose set forth.

3. In a steam-boiler attachment of a downdraft furnace, the combination of hollow grate-bars, front and rear manifolds with 

